214 0. C. Marsh on Cretaceous and Tertiary Birds. 
ractes, with which it appears to coincide in all important 
characters. 
The principal dimensions of this humerus are as follows: 
Total length, - - - - : 96:2™" 
Transverse diameter of proximal end, . - $F 
Vertical diameter of articular head, = - . 14:2 
Transverse diameter of articular head, - - 82 
Vertical diameter of distal end, - - - 13°8 
Longer diameter of shaft at center, nT ee) Be 
Shorter diameter of shaft at center, - - 5° 
, on 
distal extremity, for the tendons of the triceps muscle, are of 
nearly equal width, the upper depression being somewhat wider 
and evidently belonging to the same gen as presented to 
the Philadelphia Academy a few years since by Dr. A 
Hamlin, who obtained it in the’ Post-tertiary clays, neat 
Banyor, Maine, at a depth of forty-seven feet below the surface. 
It appears to be distinct from the above species, as well as from 
A right humerus, closely resembling the preceding specime?, 
us, was presen 
Grus Haydeni Marsh, sp. nov. : 
_ The various  inereioeng that have been made in the Tertiary 
deposits of the Upper Missouri region, so remarkably rich 12 
mammalian ins, have, s say, brought to light ee 
ra sRuemrrsatea di ge Gra ee 
@ singl oe en which can with certainty 
-veferred to the class of birds; although the material collected 
